Mapo-IOB/RuleManagerWeb/RuleManager.UI/Pages/FileUpload2.razor.cs

using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Components;
using System.Net.Http;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Components.Forms;
using Microsoft.AspNetCore.Components.Routing;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.Web.Virtualization;
using Microsoft.JSInterop;
using RuleManager.UI;
using RuleManager.UI.Shared;
using System.Linq;
using System.Net.Http.Headers;
using System.Text.Json;
using Microsoft.Extensions.Logging;

namespace RuleManager.UI.Pages
{
    public partial class FileUpload2
    {


        [Inject]
        private ILogger<FileUpload2>? Logger { get; set; }

        private List<File> files = new();
        private List<UploadResult> uploadResults = new();
        private int maxAllowedFiles = 3;
        private bool shouldRender;
        protected override bool ShouldRender() => shouldRender;
        private async Task OnInputFileChange(InputFileChangeEventArgs e)
        {
            shouldRender = false;
            long maxFileSize = 1024 * 1024 * 15;
            var upload = false;
            using var content = new MultipartFormDataContent();
            foreach (var file in e.GetMultipleFiles(maxAllowedFiles))
            {
                if (uploadResults.SingleOrDefault(f => f.FileName == file.Name)is null)
                {
                    try
                    {
                        var fileContent = new StreamContent(file.OpenReadStream(maxFileSize));
                        fileContent.Headers.ContentType = new MediaTypeHeaderValue(file.ContentType);
                        files.Add(new()
                        {Name = file.Name});
                        content.Add(content: fileContent, name: "\"files\"", fileName: file.Name);
                        upload = true;
                    }
                    catch (Exception ex)
                    {
                        Logger.LogInformation("{FileName} not uploaded (Err: 6): {Message}", file.Name, ex.Message);
                        uploadResults.Add(new()
                        {FileName = file.Name, ErrorCode = 6, Uploaded = false});
                    }
                }
            }

            if (upload)
            {
                var client = ClientFactory.CreateClient();
                var response = await client.PostAsync("https://localhost:5001/Filesave", content);
                if (response.IsSuccessStatusCode)
                {
                    var options = new JsonSerializerOptions{PropertyNameCaseInsensitive = true, };
                    using var responseStream = await response.Content.ReadAsStreamAsync();
                    var newUploadResults = await JsonSerializer.DeserializeAsync<IList<UploadResult>>(responseStream, options);
                    if (newUploadResults is not null)
                    {
                        uploadResults = uploadResults.Concat(newUploadResults).ToList();
                    }
                }
            }

            shouldRender = true;
        }

        private static bool FileUpload(IList<UploadResult> uploadResults, string? fileName, ILogger<FileUpload2> logger, out UploadResult result)
        {
            result = uploadResults.SingleOrDefault(f => f.FileName == fileName) ?? new();
            if (!result.Uploaded)
            {
                logger.LogInformation("{FileName} not uploaded (Err: 5)", fileName);
                result.ErrorCode = 5;
            }

            return result.Uploaded;
        }

        private class File
        {
            public string? Name { get; set; }
        }
    }
}